Elmo is taking pictures of his friends when they hear someone say something. It's Camouflage Carla! She is camouflaging and blending into the wall behind her. Elmo and Rosita want to camouflage too!

Elmo, Rosita and Telly learn about the scientific process while investigating everyone's bathing habits.

Elmo, Abby and Leela help their chicken T-ball teammates overcome their fear of thunderstorms.

While waiting for his Super Grover cape to be cleaned at the coin laundry, Grover becomes a superhero called the Iron Monster to help fellow patrons with their problems. But he only makes things worse until Leela intervenes.

Elmo is sleeping over at Maria and Luis' apartment. When Elmo tries to sleep, he hears a strange noise. He calls them in, but the sounds stop when they listen.

Telly, Abby and Elmo want to pretend to be the superheros in "The Furry Four," Telly's favorite comic book, but need someone to be the fourth member of the group.

It's a very windy day on Sesame Street. Elmo and Telly are just about to play a game of basketball. When they return from eating a healthy power snack, their ball is missing! It's a real mystery and they need to investigate to solve the problem!

Elmo makes everyone on Sesame Street sing---with a wave of Abby's magic wand.

Elmo and Abby help Bert find a type of pigeon that he's never seen. Along the way, they spot a chickadee, a red robin and a blue jay.

Big Bird and Snuffy learn about gravity from Gordon, but wonder what life would be like without it. With Abby's magic help, they learn that too.

Snuffy can't stop sneezing after meeting up with Big Bird, who's fresh from a dust bath. Gina thinks it might be an allergy and does some tests to see if it is.

Teddy trades his old pogo stick for a brand-new iPogo, which the salesman promises will enable him to do everything he did before and more, including making a phone call, taking a picture and cooling off hot porridge.

Abby, Elmo and Telly join the A Team, which solves people's problems by using words that begin with the letter A.

Elmo, Telly and Rosita search for Itsy Bitsy Spider in order to sing "Itsy Bitsy Spider" to her. Along the way, they meet a beetle and a grasshopper. When they finally find her, they discover she's waiting for her egg sac to hatch.

Elmo and Telly build the letter I with their "Letter of the Day" kit, but Iggy the dog---who was playing fetch with Rosita---snatches it from them and takes off.

Leela, who's been making bracelets to celebrate the Indian holiday Rakhi, waits for a special present from her brother in India. Meanwhile, Chris and Elmo decide to throw a Rakhi party for her since she's feeling homesick.

On a rainy day, Elmo waits for puddles to form so that he can splash in them. He pretends to shower with Baby Bear; watches Stinky drink the rain; and meets Cookie Monster, who pretends the rain drops are cookies.

The Super Food Super Heroes come to the aid of Super Grover and Elmo, who are unsure of what a kiwi is; Rosita, whose bag of crunchy twists spilled when Super Grover opened it for her; and Super Grover himself, whose decision to skip breakfast has left him too weak to lift a rooster's heavy suitcase.

Twins are celebrated with their own special day. Chris introduces his twin sister Christy; Abby and Zoe decide they want to be each other's twin.

Vegetables protest Telly's lettuce-free tuna sandwich, Zoe's leftover broccoli and Cookie Monster's preference for cookies.

Fairy-tale characters solve problems with science. Cinderella learns whether a pumpkin can float; the Three Little Pigs build a sturdy house that can't be blown down by the Big Bad Wolf.

Elmo and Abby help Vergil Von Vivaldi (Michael McKean) put together a rock band consisting entirely of rocks. Along the way, they point out everything on Sesame Street that's made of rock, including the sidewalk, buildings and a garden statue.

Zoe asks Elmo to watch her pet rock Rocco for her, but he's too busy playing with Baby David to notice when the rock disappears. He tries to placate Zoe by giving her a new rock, then uses his memory to figure out where the rock went.

Oscar and two other grouches set out to dirty the clean neighborhood, but their attempts backfire.

Oscar tries to give his mom the worst Grouchy Mother's Day ever, but he has keen competition from his sister Bunny. Also: the "Word on the Street" features Rachel Griffiths ("Brothers & Sisters") discussing the word "dozen" with Elmo.

Abby uses magic to dress Leela and Chris for a party.